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LOUIS DE SOULAGES, RAYMOND GAHUG, OF TQULOUSE', FRANCE.

IMPRQVEENT EN EXPL$WEMPS5TEQNS.

Specification forming part of Letters Patent No. EQAL deified September 19, 1876; application filed August 7, 1876.

To all ichom it may ooncem:

Be it known that we, Louis DE SOULAGES and RAYMOND CAHUO, of-Toulouse, in the Department of the Haute Garonne, Republic of France, have iiivented'a new and useful Improvement in Explosive Compounds, of

which the following is a specification:

The object of our invention is to furnish for mining purposes a blasting-powder whose manufacture, storage, or. use may be accomplished without theleest danger of accident,

duotion of e mining-powder of nitrate oi pot.

ash or equivalent salts, sulphur, and soot or temp-block, with tsnnerfs bark, sawdust, or siniilor separating ingredients, ground and named, in suitable proportions, with e soiution of sulphate of iron in water, to be boiled and treated therewith under a, certain temper ature until the powder is obtained.

in manufacturing the powder the ingredients are employed in the following proportrons; Nitrate of potash, of soda, or of lime, from forty-eight to seventy parts; sulphur, from eight to sixteen purts;'soot or lampbleek, from one to nine parts and, lastly, in proportion to the nitrate, sulphur, and corhon employed, a corresponding quantity of tenners bark or sawdust, used either sepsrstely or in mixture, for rendering the treat ment of the explosive ingredients, and finally the powder produced,-entirely without danger of explosion until applied in proper manner,

The ingredients are ground to suitable tineness, and then placed in a boiler oi' lerger size than would be required for the purpose of just holding the ground parts, The inge- I 'dients are mixed and thoroughly stirred in the holler, and moistened by a solution of sulphete of iron .in'water, for the purpose of purifying the different ingredients, the proportionof sulphate of iron being: from tire to six parts in one hundred ports of water, The

ingredients are then exposed for a suitable length of time in the boiler-to the notion of heat at a temperature of trom 120- to 130 of Celsius (240 to 260 Fahrenheit) until the mass becomes entirely liquid, with. the parts so combined as to form a. uniform black paste, The boiler is then removed from the action of the heat, and the contents allowed to cool oil, to be then dried at a high temperature.

The compound forms then a powder of greet or or less degree of fineness, aeoordingto the proportions and oondition of the materials used, of e hleolrish colon-end a densit; of about 3.6%. it they be stored for considerehle length of time without undergoing the least alteration or deterioration.

The suiphste-of-iron solution is employed to purify the impure oairbons employed, and preduee the inexplosihility of the ingredients in the open air, which gives greater safety of its in the atmospheric air the powder ashes iire and burns like eny other inflammable hotly brought in'uontaot with en ignited body or e iiume of sufioient intensity, producing no shook or explosion whatevern Neither etinospherie electricity, nor shocks of any hind, have any notion on the powder, which expiodes only when firmly temped or compressed in the here-hole, to be ignited like the ordh nary ruining-powder by means of a r ning fuse.

The quantity and nature of the do reloped on ignitio'n in oompressedstete pro duos e dynamical efi'eot of large power, nos-fly equal to dynamite, end without the dangerone propertiesof the same.

As the powder may be ignited with difiouity in the air, and as it does not detonate without being compressed, it may be stored in all inhabited places with perfect safety,

Having thus describedour invention, we eluizn' as new and desire to secure by Letters Potentl. A mining-powder composed of nitrate of potash, sulphur, lamp-black, and tanningherlr or sawdust, and sulphate of iron, substentiully in the manner and in the proportious set forth.

2. The process of forming a compoupd for is-produced, then cooling and drying the same, mining purposes, which shall be ineombustias described. ble at low temperature and hon-explosive ex- L. DE SOULAGES. cept when umler pressure, by first heating nitrate of potash, carbon, and sulphur in the Witnesses: presence ofsawdust and a solution of sul- DURAND,

/ phate of iron till a homogeneous liquid mass IEUFORT.

RND. GAHUG. 

